import hashlib
from django.conf import settings
import uuid

def md5(string):
    """MD5加密"""
    # 加盐（并且要求是字节类型）
    hash_object = hashlib.md5(settings.SECRET_KEY.encode('utf-8'))
    hash_object.update(string.encode('utf-8'))
    return hash_object.hexdigest()

def uid(string):
    data = "{}-{}".format(str(uuid.uuid4()),string)
    return md5(data)